Comment 4 for bug 1912044

So under grub rescue, with four commands lines

set root=(hd0,gpt3)
set prefix=(hd0,gpt3)/usr/lib/grub
insmod nornal
normal

then under grub, with three commands lines
linux /boot/vmlinuz root=/dev/sdd3 ro
initrd /boot/initrd.img
boot

This troubleshooting works but it is not normal to have to use it!